Franklin Covey Style Guide for Business and Technical Communication

I'm an instructor / developer with a large midwest insurance company. In that role, I teach writing skills to our employees. While I have many other style guides, this book by FranklinCovey is a delightful surprise. It has 440 magazine quality pages with vivid color illustrations, side bars, explanations, definitions, descriptions, and examples. If you're looking for a comprehensive style guide that you'll be happy with on your first purchase, make this book your first choice.